Effects of Different Factors on Electrical Equipment UV Corona Discharge Detection

Abstract

Abstract:As a non-contact discharge detection method, ultraviolet (UV) imaging can rapidly, directly, and securely detect corona discharges. Therefore, UV imaging has been widely applied to power systems. To study the influences of different factors on UV corona discharge detection, two typical types of UV imagers (DayCor ® Superb and CoroCAM ® 6D) were utilized. Results show that the observation angle has little impact on UV detection if no obstacles block the detection line of sight. Given that different UV imagers have different optimal imager gains, photon numbers under different gains could be calibrated to the values under optimal gains in accordance with the gain correction formula. Photon numbers decrease with the increase in the square of observation distance. Detection results under different observation distances could be corrected to the contrast distance after the detection of electrical equipment. The photon numbers of different UV imager types could be corrected in accordance with the instrumental correction factor. The results of this study can provide references to improve the applications and standardizations of UV imaging technology in corona discharge detection.

ZnO Quantum Dot Decorated Zn2SnO4 Nanowire Heterojunction Photodetectors with Drastic Performance Enhancement and Flexible Ultraviolet Image Sensors

“…As an important optoelectronic device, UV image sensors are widely applied in crime investigation, oil spill detecting, fire monitoring, and electrical power line inspection. − With the fast development of flexible optoelectronics, flexible image sensors have also triggered more and more interest. − Due to the superior sensitivity, flexibility, and stability, the ZnO QD decorated ZTO NW flexible photodetectors have great potential for flexible UV image sensor applications. To demonstrate this application, flexible photodetectors were integrated into a 10 × 10 array, which works as a 10 × 10 pixel flexible image sensor to sense the letters “F” and “E” under a bending state.…”

“…Over the past decades, ultraviolet (UV) sensing technology has triggered enormous interest because of its wide applications in crime investigation, oil spill detecting, fire monitoring, and electrical power line inspection. − Moreover, flexible UV image sensors can be applied in much wider range applications because of their attractive features of being flexible, portable, and wearable. − However, due to the low signal intensity of UV radiation in many practical applications, high-performance flexible UV photodetectors are critical to realize flexible UV imaging . So far, various wide-band-gap semiconductor materials have been explored to fabricate UV photodetectors, such as III-nitrides, − II–VI compounds, − III–VI compounds, , and IV–VI compounds. , Among these wide-band-gap semiconductor materials, metal oxides have been extensively investigated because of their abundant reserves, excellent stability, and environmentally benign nature .…”

A consistency method of discharge detection results at solar‐blind ultraviolet based on a radiation transmission model

“… (1) Parameter setting of atmospheric modes: According to the research [23], if it is ensured that the fields of view of UV imagers to UV radiation sources are not obstructed or subject to interference, the influences of the detection angle on detection results can be ignored. The MODTRAN calculation model provides a variety of parameter selections for the atmospheric model and the user‐defined atmospheric model is selected.…”

Impact Transient Characteristics and Selection Method of Voltage Transformer Fuse

“…The experimental setup is shown in Figure 16. The corona test scheme was used to break the fuse tube wall, so that the internal fuse was exposed to air and the corona characteristics of the fuse were observed by an ultraviolet imager under different voltages [21][22][23]. The epoxy support plate hada size of 100 mm × 400 mm × 4000 mm.…”